Thrombus of inferior vena cava presenting as right atrial tumor. Roentgenographic, phonoechocardiographic, angiographic, and surgical findings.

A large tumor of the right atrium was found to be only the proximal end of a bland thrombus of the inferior vena cava. Of special interest were certain echocardiographic findings, including persistent delay in closure of the tricuspid valve after successful removal of the thrombus.